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            <p>
                To make your project more structured, group files into clusters by using file nesting rules.
                For example, you can make all <span class="code_emphasis">_test</span> files children of main files.
            </p>
            <p>To define a rule, click the <span class="control">Show Options Menu</span> icon in the
                <span class="control">Project</span>
                tool window, select <span class="control">File Nesting</span>, and type a rule in
                <span class="control">Child file suffix</span>
                field (for example, <span class="code_emphasis">_test.go</span>).
            </p>
            <p class="image"><img src="images/tips_go_file_nesting_rules.png" alt="Nesting rules"/></p>
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